You earn 7.50 per hour to your uncle in his shop you earn 33.75 write and solve an equation to find how many hours you worked

You earn 7.50 times how many hours you work, h.
This gives you the expression 7.50h.
If you earned 33.75, you can set up your equation as 7.50h = 33.75.
Divide both sides by 7.50.
You end up with h = 4.5, so you worked for 4.5 hours.

Do you need with the x value for the minimum? its always between the two intercepts for a parabola